KR100376919B1 - Alternator - Google Patents

Abstract

The present invention provides an alternator capable of preventing short circuits at the coil end, improving cooling of the stator windings, and reducing noise.

In the vehicular alternator of the present invention, the multiphase stator winding 32 extends in the axial direction of the first conductor portion produced from the first layer in the slot 15a in addition to the slot 15a on the cross-sectional side of the stator core 15. It possesses a large number of connecting portions 32a, 32b to which the tip portion extending in the axial direction of the second conductive line portion produced from the second layer in the slot 15a is spaced apart from the tip portion by a predetermined number of slots in the circumferential direction. A coil end portion in which a plurality of rows 32a and 32b are arranged in a circumferential direction is formed, and each of the connection portions 32a and 32b is spaced 1/2 slot apart in a circumferential direction.

Description

Alternator {ALTERNATOR}

The present invention relates to a stator winding of the stator, in particular with respect to an alternator for a vehicle mounted on a vehicle such as a passenger car or a truck.

15 is a cross-sectional view of a conventional automotive alternator.

In the automotive alternator, the render-type rotor (7) is freely rotated through the shaft (6) in a case (3) composed of an aluminum front bracket (1) and a rear bracket (2), and the stator (8) It is comprised by being fixed to the inner wall surface of the case 3 so that the outer peripheral side of the rotor 7 may be covered.

The shaft 6 is rotatably supported by the front bracket 1 and the rear bracket 2. The pulley 4 is fixed to one end of the shaft 6, and the rotational torque of the engine can be transmitted to the shaft 6 through a belt (not shown).

A slip ring 9 for supplying current to the rotor 7 is fixed to the other end of the shaft 6 and disposed in the case 3 so that a pair of brushes 10 abut this slip ring 9. It is stored in the brush holder 11. A regulator 18 for adjusting the magnitude of the alternating voltage generated by the stator 8 is attached to the heat sink 17 attached to the brush holder 11. A rectifier 12 electrically connected to the stator 8 and rectifying the alternating current generated by the stator 8 with a direct current is mounted in the case 3.

The rotor 7 is provided so as to cover the rotor coil 13 that generates magnetic flux by flowing an electric current, and the magnetic flux generated by the rotor coil 13 to generate magnetic poles. It is composed of a pair of pole cores 20 and 21 formed. The pair of pole cores 20 and 21 are made of iron, and a plurality of claw-shaped poles 22 and 23 of the claw-like shape are respectively protruded at an equal pitch in the circumferential direction to the outer circumferential surface, and the claw pole poles 22 and 23 ) Is fixed to the shaft 6 to face each other.

In addition, the centrifugal fan 5 is fixed to both end faces in the axial direction of the rotor 1.

The stator 8 winds the stator core 15 and the stator core 15 around the stator core 15, and stator windings in which alternating current is generated by the change of the magnetic flux from the rotor 7 as the rotor 7 rotates. It consists of (16).

Next, the structure of the stator winding 16 is explained using the winding diagram of FIG. The stator winding 16 is composed of a phase stator winding portion 16a, b phase stator winding portion, and c phase stator winding portion. The a-phase stator winding part 16a, the b-phase stator winding part, and the c-phase stator winding part are mutually arrange | positioned one slot 15a, and are molded and connected. 16 is a winding diagram of the a-phase stator winding portion 16a, and the b-phase stator winding portion and the c-phase stator winding diagram are not shown. In this figure, solid lines indicate conducting wires (connected portions of the conductor segments described later) on the rear bracket 2 side, and dotted lines indicate conducting wires (connected portions of the conductor segments described later) on the front bracket 2 side. Doing.

The a-phase stator winding portion 16a includes first and second winding portions 54 and 55. The first winding portion 54 connected to the phase-a-phase induction line 100 has a slot number of 1 and a second position on the outer circumferential side in the slot 15a (the first one on the outer circumferential side and the second on the second side). The third is called 3 and the fourth is called 4) and extends counterclockwise from the front bracket 1 side into the slot 15a of slot number 4 on the front bracket 1 side. And it extends clockwise from the side of the rear bracket (2), enters into the slot (15a) of No. 4 of slot number 4, and exits from the front bracket (1) side. Next, it extends counterclockwise, enters into slot 15a of slot number 4 at the front bracket 1 side and exits to the rear bracket 1 side. Then, it extends counterclockwise, and enters into the slot 15a of the 2nd slot number 1, and exits to the front bracket 1 side.

In this way, the conductors slaughtered from the 1st layer in each slot 15a toward the rear bracket 2 side are located at the 4th layer in the slot 15a spaced three slots in the clockwise direction and the front bracket 1 Go toward the side. In addition, the lead wire drawn from the third layer in each slot 15a to the rear bracket 2 side is the front bracket at the second layer in the slot 15a spaced in the third slot counterclockwise direction. We enter toward (1) side. Finally, the conductor extending from the third floor of slot number 34 to the rear bracket 2 side extends counterclockwise to reach the first floor of slot 2 of slot number 1, which is the first winding part 54. Is the end point.

The end point of the first winding part 54 is also the starting point of the second winding part 55, and the second winding part 55 extends clockwise and is located at the second floor of slot number 34 at the front bracket 1 side. It enters the track 15a. Subsequently, the lead wire drawn from the rear bracket 2 side extends clockwise from the rear bracket 2 side into the slot 15a of the third layer of slot number 31 and exits to the front bracket 1 side. .

Next, it extends clockwise and enters the slot 15a of slot number 28 from the front bracket 1 side and exits to the rear bracket 2 side. Thereafter, it extends counterclockwise to enter the slot 15a of address 1 of slot number 31 and exit to the front bracket 1 side. This lead extends clockwise and enters slot 2 of slot number 28.

In this way, the lead wire drawn from the 4th slot in each slot 15a to the rear bracket 2 side enters into the front bracket 1 side at the 1st slot 15a in 3 slot anticlockwise directions. Moreover, the conducting wire drawn out from the 2nd address in each slot 15a to the rear bracket 2 side enters into the front bracket 1 side at the 3rd address in the slot 15a which separated 3 slots clockwise.

Finally, the conducting wire extending from the 3rd slot number 1 to the front bracket 1 side extends clockwise to reach the 4th slot number 34, which is the end point of the second winding part 55. . The neutral point leader line 101 is connected to this end point.

Thus, in the a-phase stator winding part 16a, the 1st winding part 54 connected to the a-phase induction line 100 turns counterclockwise as a whole, changing clockwise direction in many places every three slots. Direction once, and then the second winding section 55 rotates in a clockwise direction as a whole while changing the direction in a counterclockwise direction at every three slots, and the four phase a stator winding section 16a is Consists of.

In addition, description is abbreviate | omitted like a phase stator winding part about b phase stator winding part and c phase stator winding part.

The three-phase stator winding 16 having the above configuration is formed by joining a plurality of short-conducting conductor segments 50 shown in FIG.

The conductor segment 50, which is a component of the conductive wire, is formed by forming an approximately insulated U-shaped copper wire member coated with an insulating coating, and a pair of straight portions 51a, 51b and a straight portion accommodated in the slot 15a. Connecting portions 53a and 51b, which are connected to each other, are connected to the connecting portion 52 and the straight portions 51a and 51b, respectively. And 53b.

Next, the procedure for forming the a-phase stator winding portion 16a using the conductor segment 50 will be described.

First, as shown in FIG. 16, one straight portion 51a of the conductor segment 50 and the other straight portion 51b separated by three slots are located at the rear bracket 2 side at a predetermined slot number and address. In the slot 15a, the straight portions 51a and 51b of the conductor segment 50 are arranged side by side in four rows in the radial direction.

Then, on the front bracket 1 side, as shown by the dotted line in the winding diagram of FIG. 16, the connecting portion 53a directed from the straight portion 51a on the front bracket 1 side and the straight portion 51b separated by three slots. The connection part 53b produced | generated from this is joined, and the 4-phase a phase stator winding part 16a is formed. In addition, as can be seen from the dotted lines in Fig. 16, the connecting portions 53a of the conductor segments 50 respectively directed from the first layer and the third layer in the slot 15a to the front bracket 1 side are three slots in the clockwise direction. The connecting portions 53b of the conductor segments 50 respectively formed on the front bracket 1 side from the second and fourth layers in the slotted slot 15a are joined to the front bracket 1 side, respectively.

The front end portions of the connecting portions 53a and 53b of the conductor segment 50 are overlapped in the radial direction at a position almost in the middle between the two slots 15a in which the conductor segment 50 is inserted from the ease of the bending process. 29) is wound up and soldered.

18 and 18 with the inner circumferential side connection part 56 which is a connection part between the front-end | tip parts of the inner peripheral side connection part 53a, 53b, and the outer circumferential side connection part 57 which is a connection part between the connection part 53a, 53b of an outer peripheral side, and FIG. As shown in FIG. 19, they are arranged side by side in the radial direction.

Similarly, a four-turn b-phase stator winding portion and a c-phase stator winding portion are formed, and then each of the phase stator winding portions is molded and connected to form a three-phase stator winding 16.

In the vehicle alternator configured as described above, current is supplied from the battery (not shown) to the rotor coil 13 through the brush 10 and the slip ring 9, and magnetic flux is generated. By this magnetic flux, the claw box pole 22 of one pole core 20 is magnetized to the N pole, and the claw box pole 23 of the other pole core 21 is magnetized to the S pole. Meanwhile, the rotational torque of the engine is transmitted to the shaft 6 through the belt and the pulley 4, and the rotor 7 is rotated.

Thus, a rotating magnetic field is applied to the stator windings 16 and electromotive force is generated in the stator windings 16. The electromotive force of the alternating current is rectified to the direct current through the rectifier 12, and the magnitude thereof is adjusted by the regulator 18, and charged in the battery.

In the automotive alternator, the rotor coil 13, the stator windings 16, the rectifier 12, and the regulator 18 always generate heat during power generation.

Thus, in order to cool the heat generated by the power generation, the intake holes 1a, 2a and the exhaust holes 1b, 2b are provided in the front bracket 1 and the rear bracket 2. As indicated by the dashed-dotted line in Fig. 15, outside air is applied to the heat sink 19 of the rectifier 12 and the heat sink 17 of the regulator 18 by the rotation of the centrifugal fan 5 on the rear side. The rectifier 12 and the regulator 18 are cooled by suction through the intake hole 2a provided toward the side, and then bent in the centrifugal direction by the centrifugal fan 5 to form the coil end 16b on the rear side of the stator winding 16. ) Is cooled and discharged to the outside from the exhaust hole 2b.

On the other hand, on the front bracket 1 side, outside air is sucked in the axial direction from the intake hole 1a by the rotation of the centrifugal fan 5, and then bent in the centrifugal direction by the centrifugal fan 5, thereby stator winding 16 The coil end 16a on the front side of the coolant is cooled and discharged to the outside from the exhaust hole 15.

Here, when the stator winding 16 has a high degree of heat generation and a high temperature, its output characteristics are deteriorated. Thus, the coil end 16b is placed between the centrifugal fan 5 and the exhaust holes 1b and 2b. It is configured to reliably cool.

In the vehicle AC generator having the above-described configuration, the inner circumferential side connecting portion 56 and the outer circumferential side connecting portion 57 are close to the radial direction, and it becomes difficult to wind the connecting portions 53a and 53b with the clamp 29, and soldering is performed. It tends to be mounted on the adjacent inner circumferential side connection part 56 and the outer circumferential side connection part 57, and there exists a problem of reducing connection workability and yield.

In addition, since the inner circumferential side connecting portion 56 and the outer circumferential side connecting portion 57 are arranged in a row in the radial direction, the cooling air discharged from the centrifugal fan 5 hardly collides with the outer circumferential side connecting portion 57, There is also a problem that the temperature of the conductor segment 50 rises, which is melt-dropped to the other conductor segment 50 and the solder, and short-circuited with other adjacent conductor segments 50.

In addition, since the vehicle alternator is attached to the engine having the highest vibration in the vehicle, there is also a problem that the inner circumferential side connecting portion 56 and the outer circumferential side connecting portion 57 are shorted due to vibration.

In addition, even when the joints 53a and 53b of the conductor segment 50 are bonded by, for example, TIG welding instead of soldering, the inner circumferential side connecting portion 56 and the outer circumferential side connecting portion 57 are close to the radial direction. Therefore, when welding one connection part, the other adjacent connection part is welded at the same time and connected mutually, and also there existed a problem that joining workability and yield fell.

In the connection by TIG welding, as shown in Figs. 21 and 22, the copper fitting jig 40 is arranged in a straight line, and the conductor segments 50 are preserved by aligning the tips of the fitting jig 40 with each other. The heat of the city was transferred to the heat dissipating jig 41 through the catching jig 40 to dissipate heat. However, since the contact area between the catching jig 40 and the conductor segment 50 is small, the welded portion 56 at the time of welding. ), And the heat of 57 is not sufficiently dissipated, and even the connecting portions 53a and 53b near the connecting portions 56 and 57 become a film, and thus a good insulation state between the conductor segments 50 cannot be obtained. There is also.

Moreover, since the jig | tool 40 has preserve | saved collectively the connection parts 56 and 57 arranged in a row, there also existed a problem that storage stability was uncertain and TIG welding became unstable.

Moreover, since the jig 40 consists of soft copper and the jig | tips 40 which have this tip contact each other, there existed a problem that it was easy to be damaged and the life of the jig 40 was extremely bad.

In addition, when the insulating varnish is applied to the connection portions 56 and 57, the varnish is applied over the connection portions 56 and 57 where the varnish is adjacent to block the passage of the cooling wind, thereby preventing noise or stator windings 16. There was also a problem that the cooling performance of the product deteriorated.

An object of the present invention is to obtain an AC generator capable of preventing short circuits at the coil end while improving the cooling performance of the stator winding and reducing noise.

In the alternator according to claim 1 of the present invention, the multi-phase stator winding is separated from the slot on the cross-sectional side of the stator core by a predetermined slot number apart from the tip portion extending in the axial direction and the main direction of the first conductor portion produced from the nth layer in the slot. In the radial direction, a coil end is formed in which a plurality of connecting portions are connected to the distal end portion extending in the axial direction of the second lead portion drawn from the (n + 1) th layer in the slot, and the connecting portions are arranged in a plurality of rows in the circumferential direction. In each said connection part of each, each connection part is provided in the circumferential direction, respectively.

In the alternator according to claim 2 of the present invention, the distal end portion of the second lead portion extending from the second layer in the second slot of the first lead portion extending from the first layer in the first slot is connected. An inner circumferential side connection portion to which an outer circumferential side connection portion, a distal end portion of the first lead portion extending from the third layer in the first slot, and a tip portion of the second lead portion extending from the fourth layer in the second slot, are connected; Is 1/2 slot away.

In the alternator according to claim 3 of the present invention, the distance between the inner circumferential side connecting portion on the inner circumferential side of the stator core and the end face of the stator core, and between the outer circumferential side connecting portion on the outer circumferential side of the stator core and the end face of the stator core It is different from the distance.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the principal part of the stator of the vehicular alternator of Embodiment 1 of this invention.

Fig. 2 is a plan view showing the stator core and the connecting portion when the stator of Fig. 1 is viewed from the connecting portion side.

3 is an enlarged view illustrating main parts of FIG. 2;

4 is a perspective view showing the main parts of a stator of the vehicular alternator according to the second embodiment of the present invention;

Fig. 5 is a perspective view showing the main parts of a stator of the vehicular alternator according to Embodiment 3 of the present invention.

Fig. 6 is a plan view showing the stator core and the connecting portion when the stator of the vehicular alternator according to Embodiment 4 of the present invention is viewed from the connecting portion.

7 is an explanatory diagram when forming the connection part by TIG welding.

8 is a side cross-sectional view of FIG.

Fig. 9 is a plan view showing the stator core and the connecting portion of the stator of the vehicle alternator according to the fifth embodiment of the present invention as viewed from the connecting portion.

10 is an explanatory diagram when the connection portion of FIG. 9 is formed by TIG welding;

11 is a side cross-sectional view of FIG. 10.

12 is a winding diagram of a vehicular alternator according to Embodiment 6 of the present invention;

13 is a perspective view of main parts of the stator of FIG. 12;

14 is a perspective view of main parts of a stator of the vehicular alternator according to Embodiment 7 of the present invention;

15 is a cross-sectional view of a conventional vehicle alternator.

16 is a winding diagram of the vehicle alternator of FIG.

The perspective view of the principal part when the stator of FIG. 15 is seen from the rear bracket side.

Fig. 18 is a perspective view of the main parts when the stator of Fig. 15 is viewed from the front bracket side.

Fig. 19 is a plan view showing the connecting portion and the stator core when the stator of Fig. 15 is viewed from the front bracket side.

20 is an enlarged view illustrating main parts of FIG. 19;

21 is an explanatory diagram when a connection portion is formed by TIG welding;

FIG. 22 is a side cross-sectional view of FIG. 21;

<Description of the symbols for the main parts of the drawings>

15: stator core, 15a: slot, 15A: stator core,

30,30A, 30B, 30C, 30D, 30E, 30F: stator,

32,33,34,35,36,101,111: stator winding,

32a, 33a, 34a, 35a, 36a: inner peripheral connection portion,

32b, 33b, 34b, 35b, 36b: outer peripheral side connecting portion,

100,110: conducting wire, 100a, 110a: first conducting wire part,

100b, 110b: second lead portion, 101a, 111a: coil end.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same or equivalent parts as in the prior art will be described with the same reference numerals.

Embodiment 1

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the main part of a stator 30 of a vehicular alternator according to Embodiment 1 of the present invention, and Fig. 2 is a view of the stator 30 of Fig. 1 from the front bracket 1 side (connection part side). 3 is a plan view showing the stator core and the connecting portion at the time, and FIG. 3 is an enlarged view of the main portion of FIG.

In Fig. 1, the stator cores 15 are formed in a cylindrical shape and 36 slots in the circumferential direction are formed so that the slots 15a having the groove direction in the axial direction are opened on the inner circumferential side.

The stator winding 32 is composed of a plurality of conductor segments 50 formed by forming an insulating coated copper wire into a substantially U shape, and is shown in the winding diagram of FIG. 16 at each slot 15a of the stator core 15. It is attached as indicated.

Here, the first segment and the conductor segment 50, which is the second conductor, are connected to the front bracket 1 side from the number 2 in the slot 15a of the slot number 19 in FIG. The length of 53a) is slightly longer than the length of the connecting portion 53b extending from the first address in the slot 15a of the slot number 22 separated by three slots to the front bracket 1 side. The length of the connecting portion 53a extending from the fourth address in the slot 15a to the front bracket 1 side is slightly shorter than the length of the connecting portion 53b extending from the third address in the slot number 22 to the front bracket 1 side. It is molded.

In this way, the U-shaped conductor segment 50 is soldered to the inner circumferential side connecting portion 32a and the outer circumference of the distal ends of the connecting portions 53a and 53b by varying the lengths of the left and right connecting portions 53a and 53b. As shown in Figs. 2 and 3, the side connecting portion 32b is arranged so as to be slit by half slot in the circumferential direction.

Here, the number of slots 15a is 36, the interval between the slots 15a is 10 degrees, and the interval angle between the inner peripheral side connecting portion 32a and the outer peripheral side connecting portion 32b and the slot 15a is 1/2. 5 ° shifted.

In the vehicle alternator having the above-described configuration, first, connecting portions 53a and 53b of each conductor segment 50 are respectively inserted into predetermined slots 15a on the rear bracket 2 side as shown in FIG. It protrudes to the front bracket 1 side, and after that, it bends so that it may mutually separate in a circumferential direction, and the front-end | tip part overlaps radially. At this time, the distal ends of the connecting portions 53a and 53b on the inner circumferential side of the conductor segment 50 and the distal ends of the connecting portions 53a and 53b on the outer circumferential side of the conductor segment 50 are 1 in the circumferential direction. / 2 slot is shifted. The tip ends are wound around the clamp 29 to be fixed, and then welded by solder to form the inner circumferential side connecting portion 32a and the outer circumferential side connecting portion 32b.

According to the first embodiment, since the inner circumferential side connecting portion 32a and the outer circumferential side connecting portion 32b are slit by 1/2 slot in the circumferential direction and are arranged without overlapping in the radial direction, the connecting portions 53a and 53b are separated from each other. Of the clamp 29 is easy to be wound, and it is difficult to raise the solder to the adjacent connecting portions 32a and 32b, thereby improving connection workability and yield.

Moreover, the cooling air discharged from the centrifugal fan 5 improves the cooling property of the connection part 53a, 53b of the conductor segment 50 of the outer peripheral side.

When the inventor of the present application measured the temperature of the stator 30 by operating the vehicle alternator instead of the conventional stator 8 in the stator 30 of this embodiment 1, the temperature of the stator 30 is a conventional stator. Compared with (8), about 10 degreeC fell and the solder of the connection part 32a, 32b melted and did not flow down.

In addition, since the inner circumferential side connecting portion 32a and the outer circumferential side connecting portion 32b are sufficiently separated from each other, unwanted contact that the connecting portions 32a and 32b contact and short-circuit by vibration can be avoided.

Embodiment 2

In the first embodiment, the front ends of the conductor segments 50 are joined by soldering. In the second embodiment, the front ends of the conductor segments 50 are joined by solder welding as shown in FIG. Insulation varnish is applied to the surface to form the inner circumferential side connecting portion 33a and the outer circumferential side connecting portion 33b. The other configuration is the same as that of the first embodiment.

In the stator 30B according to the second embodiment, the same effect as in the first embodiment can be obtained, and the insulation varnish is not formed over all of the adjacent inner circumferential side connecting portion 33a and outer circumferential side connecting portion 33b. It can be prevented that the insulation varnish penetrates the passage of the cooling wind, causing generation of noise and deterioration in the cooling performance of the stator winding 33.

Embodiment 3

In the stator 30B of this Embodiment 3, as shown in FIG. 5, the axial height of the inner peripheral side connection part 34a is made higher than the axial height of the outer peripheral side connection part 34b.

The other configuration is the same as that of the second embodiment.

In the stator 30B according to the third embodiment, the distance between the inner circumferential side connecting portion 34a and the outer circumferential side connecting portion 34b of the stator winding 34 can be further increased, thereby improving welding workability and yield, and improving vibration. Short circuits between the connecting portions 34a and 34b can be prevented.

Embodiment 4

In the stator 30c of this Embodiment 4, as shown in FIG. 6, the inner peripheral side connection part 35a and the outer peripheral side connection part 35b are inclined so that it may follow the rotation direction of the rotor 7 with respect to a radial direction. It is. Here, the inner circumferential side connecting portion 35a and the outer circumferential side connecting portion 35b are inclined 30 ° with respect to a radial line passing through the axis center of the stator winding 15. The other configuration is the same as that of the second embodiment.

In the stator 30c according to the fourth embodiment, the cooling wind is smoothly discharged while substantially matching the discharge direction of the cooling wind from the inclined core centrifugal fans 5 of the connecting portions 35a and 35b.

The inventors of the present application measured the wind noise by operating the vehicle alternator under the condition of 10000 rpm for the motor alternator instead of the conventional stator 8, instead of the conventional stator 8. Thus, a noise reduction effect of 5 decibels was obtained.

Moreover, in each said embodiment, although the connection part was formed by the soldering solution, it is not limited to this, of course, You may form a connection part by TIG welding. TIG welding of the front ends of the connecting parts 53a and 53b is performed by TIG welding, respectively, while the front ends of the connecting parts 53a and 53b overlapped in the radial direction are preserved by the pair of fitting jig 40. At this time, since the distal end of one of the fitting jig 40 pushes the connecting portions 53a and 53b of the radially overlapping conductor segment 50 in the other fitting jig 40, the connecting portions 53a and ( 53b) can ensure reliable and stable welding operation.

In addition, the contact area between the connecting portions 53a and 53b and the catching jig 40 is increased, and heat during welding is transferred to the heat dissipating jig 41 through the catching jig 40 to quickly dissipate heat. At the time of welding, the occurrence of the film burn in the vicinity of the connection part of the connection part 53a, 53b is prevented, and a favorable welding state is obtained in a connection part.

Further, compared with the conventional ones shown in Figs. 20 and 21 in which the tips of the fitting jig 40 are in contact with each other, the copper jig 40 is less likely to be broken, and the inventors of the present application have experimented. The result is that the life of the jig 40 is extended by about 10 times.

Embodiment 5

In the stator 30D of the fifth embodiment, as shown in Fig. 9, the inner circumferential side connecting portion 36a and the outer circumferential side connecting portion 36b are arranged so as to be slotted 1/2 slot in the circumferential direction and have a gap A in the radial direction. have. The other configuration is the same as that of the second embodiment.

In the fifth embodiment, the gap between the inner circumferential side connecting portion 36a and the outer circumferential side connecting portion 36b can be secured wider than that in the second embodiment, so that the adjacent connecting portions 36a and 36b are used during TIG welding. It is possible to prevent the welding by winding and to further improve the workability and yield.

Also in the fifth embodiment, as shown in Figs. 10 and 11, the distal ends of the connecting portions 53a and 53b overlapped in the radial direction are stored in a state where the gap A is maintained by the pair of fitting jig 40. The tip ends of the connecting parts 53a and 53b are then welded to each other by TIG welding.

At this time, the tip of one fitting jig 40 pushes the connecting portions 53a and 53b of the radially overlapping conductor segment 50 in the other fitting jig 40, so that the connecting portion 53a, 53b is reliably preserved and can perform stable TIG welding work.

Embodiment 6

12 is a winding diagram of the stator 30E of the vehicular alternator of Embodiment 6 of the present invention.

12 is a winding diagram of the a-phase stator winding 161, and the b-phase stator winding portion and the c-phase stator winding diagram are not shown. In addition, in this figure, the solid line shows the conducting wire 100 of the rear bracket 2 side, and the dotted line shows the conducting wire 100 of the front bracket 1 side.

In practice, the stator winding portion 161 for six phases is formed by taking one slot 15a, which is recommended for conducting wire 100, and the stator winding portion 161 is molded for three phases, so that two sets of three-phase stator windings are formed. Is formed.

The stator core 15A of the stator 30E has slots 15a formed at equal intervals at 96 locations so as to accommodate two sets of three-phase stator windings corresponding to the number of magnetic poles 16 of the rotor 7. have. In the stator winding 101, one conducting wire 100 is returned outside the slot 15a on the cross-sectional side of the stator core 15A, and the slot depth direction in the slot 15a every six slots. It consists of a plurality of windings 161 recommended by the wave winding to alternately adopt the inner and outer layers.

That is, the conducting wire 100 drawn to the front bracket 1 side from the 1st layer in each slot 15a is introduce | transduced into the 2nd layer in the slot 15a separated by 6 slots, and it is the rear bracket 2 side. After deriving at, it is introduced to the first layer in the slot 15a which is 6 slots away. In addition, the conducting wire 100 drawn from the fourth layer to the front bracket 1 side is introduced into the third layer in the slot 15a separated by 6 slots, and is led to the rear bracket 2 side, and then again 6 slots. It is introduced to the fourth layer in the spaced slot 15a. In addition, as the conductive wire 100, a series of copper wire materials coated with insulation are used.

FIG. 13 is a perspective view when the main portion of the stator 30E of FIG. 12 is seen from the front bracket 1, and the tip portion extending in the axial direction of the first lead portion 100a produced from the first layer in the slot 15a. It consists of a series of conducting wires 100 continuously connected with the leading end part B extended in the axial direction of the 2nd conducting wire part 100b produced from the 2nd layer in the slot 15a which is 6 slots in the circumferential direction. It is. In addition, the tip portion c extending in the axial direction of the first lead portion 100a produced in the third layer in the slot 15a and the fourth layer in the slot 15a spaced 6 slots in the circumferential direction are produced. It is continuously connected with the front-end | tip part c extended in the axial direction of the 2nd conducting wire part 100b, and is comprised from the series of conducting wire 100. As shown in FIG. Both tip portions B and C are spaced apart in the circumferential direction for the half slot 15a.

In the sixth embodiment, the tip portions B and C, which are also connecting portions, are spaced apart in the circumferential direction for the half slot 15a, and do not overlap in the radial direction, so that the cooling wind discharged from the fan 5 is stator. Smoothly passing through the coil end 101a of the winding 101, the stator 30E is efficiently cooled and the temperature rise of the stator 30E is suppressed.

Embodiment 7

Fig. 14 is a perspective view of the main portion of the stator 30F of Embodiment 7 of the present invention as seen from the front bracket 1, and shows the first conductive portion 118a directed at the first layer in the slot 15a. A series of conductors 110 are connected in series with the tip portion D extending in the axial direction and the tip portion D extending in the axial direction of the second lead portion 110b produced from the second layer in the slot 15a spaced 6 slots in the circumferential direction. ) Moreover, the tip part E extended in the axial direction of the 1st conductor part 110a produced from the 3rd layer in the slot 15a, and the 4th layer produced from the 4th layer in the slot 15a separated 6 slots in the circumferential direction The tip portion E extending in the axial direction of the two conductive portions 110b is continuously connected to each other to constitute a series of conductive lines 110. Both tip portions D and E are spaced apart in the circumferential direction for 1/2 slot 15a, while the tip portion E on the inner circumferential side is disposed higher than the tip portion D on the outer circumferential side.

In the seventh embodiment, the tip portions D and E, which are also connecting portions, are spaced apart in the circumferential direction for the half slot 15a. It passes smoothly, the stator 30F is cooled efficiently, and the temperature rise of the stator 30F is suppressed.

Further, since the distal end portion E on the inner circumferential side is disposed higher than the distal end portion D on the outer circumferential side, the distance between the distal end portion D and the distal end portion E increases, and generation of a short circuit due to vibration can be suppressed.

In the stator windings of the above embodiments, a four-turn three-phase stator winding has been described. However, when high output is required at a lower speed, the number of turns of the conductor may be 6 turns or 8 turns, for example.

As described above, according to the alternator according to claim 1 of the present invention, the multiphase stator winding includes an end portion extending in the axial direction of the first conductor portion produced in the nth layer in the slot other than the slot on the cross-sectional side of the stator core; Coil end in which a plurality of connections are connected to the leading end portions extending in the axial direction of the second lead portion produced at the (n + 1) th layer in the slot away from the predetermined number of slots in the direction, and the connections are arranged in a plurality of rows in the circumferential direction. In each of the connecting portions in the radial direction, each connecting portion is provided in the circumferential direction, so that the gap between the adjacent adjacent portions in the circumferential direction can be assuredly secured, for example. When the connection part is welded, the joining workability is improved and the yield is also improved.

In addition, the cooling wind generated by the rotation of the rotor smoothly passes through the coil end of the stator winding, the stator is efficiently cooled and the temperature rise of the stator is suppressed.

Further, according to the alternator according to claim 2 of the present invention, the distal end portion of the first lead portion extending from the first layer in the first slot and the second lead portion extending from the second layer in the second slot Circumference connected to the outer circumferential side connecting portion, and the distal end portion of the first lead portion extending from the third layer in the first slot and the second lead portion extending from the fourth layer in the second slot. Since the side connection part is separated by 1/2 slot, the inner circumferential side connection part and the outer circumferential side connection part are arranged alternately at equal intervals in the circumferential direction. In addition, the cooling wind generated by the rotation of the rotor is stator winding evenly passed through the coil end, the stator is cooled efficiently without inclination, and the stator is on average Wins phases is suppressed.

Further, according to the alternator according to claim 3 of the present invention, since the distance between the inner circumferential side connecting portion on the inner circumferential side of the stator core and the outer circumferential side connecting portion on the outer circumferential side of the stator core is different from the end face of the stator core, the outer circumferential side The gap between the connecting portion and the inner circumferential connecting portion can be secured largely, and when the connecting portion is welded, the welding work and yield can be improved, and the occurrence of short caused by vibration can be suppressed.

Claims (3)

Multi-phase stator windings mounted on the rotor forming the N pole and the S pole alternately according to the rotation direction, the stator core surrounding the rotor, and the slots extending in the axial direction of the stator core and formed with a plurality of predetermined pitches in the main direction. With The multi-phase stator winding is formed in the slot away from the slot on the cross-sectional side of the stator core in the axial direction extending from the n-th layer in the slot in the axial direction with a predetermined number of slots in the circumferential direction. 1) An alternator having a plurality of connecting portions, each of which has a leading end extending in the axial direction of the second conducting portion, which is formed from the layer, and which has a coil end in which the connecting portions are arranged in a plurality of rows in the circumferential direction. An alternator in which each of the connecting portions is provided to be shifted in the circumferential direction. The method of claim 1, The outer peripheral side connecting portion and the first slot in which the front end portion of the first lead portion produced in the first layer in the first slot and the second lead portion in the second layer in the second slot are connected. An alternator having a half slot away from an inner circumferential side connecting portion to which the distal end portion of the first lead portion extending from the third layer and the distal end portion of the second lead portion extending from the fourth layer in the second slot are connected. Multi-phase stator windings mounted on the rotor forming the N pole and the S pole alternately according to the rotation direction, the stator core surrounding the rotor, and the slots extending in the axial direction of the stator core and formed with a plurality of predetermined pitches in the main direction. The multi-phase stator winding has a tip portion extending in the axial direction of the first conductor portion produced from the nth layer in the slot, outside the slot on the cross-sectional side of the stator core, and a slot separated by a predetermined number of slots in the circumferential direction. An alternator having a plurality of connecting portions connecting the tip portions extending in the axial direction of the second conductive line portion formed in the (n + 1) th layer in the inner portion, and the coil ends having a plurality of rows arranged in the circumferential direction formed therein. The distance between the inner circumferential side connecting portion on the inner circumferential side of the stator core and the end face of the stator iron core, and the outer circumferential side connecting portion on the outer circumferential side of the stator core Range and between the end face of the core is different from the alternator.